David Samson's Private Business Interests Have Come Under Scrutiny

Federal prosecutors have subpoenaed records from the Port Authority of New York and New Jersey related to the business interests of its chairman, David Samson, people familiar with the matter said Monday.

The demand for records came last week as scrutiny of Mr. Samson—a close ally of Republican Gov. Chris Christie—has increased since allegations emerged that the Port Authority closed George Washington Bridge access lanes for...